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· prob-3
Probability · Conditional probability
AMC 10 style
●●●○○ 6/10
~3 min
⏱ 0:00
A family has two children. Given that at least one is a boy, what is the probability both are boys? (Assume boys and girls are equally likely and independent.)
conditional
classic
A
1
4
\tfrac{1}{4}
4
1
B
1
3
\tfrac{1}{3}
3
1
C
1
2
\tfrac{1}{2}
2
1
D
2
3
\tfrac{2}{3}
3
2
E
3
4
\tfrac{3}{4}
4
3
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